Avon, Cally and Vila investigates a derelict spacecraft. When they return to The Liberator, they find something else has also returned with them, and Cally finds herself under the influence of a alien woman that assumes Cally's appearance and requires the crew to transport her back to her home planet, and only Avon can stop her. Written by
Did You Know?
This is the only episode to have no credited guest actors. See more
[several minutes into the episode
What is it?
Well, it looks like a door. And it's closed.